We're seeing these occur rather frequently across our sites. looking at the logs, we see a stack trace with this reference:

<our server name>/vizql/<vizql session>/javascripts/vqlweb.js:2285 $8

Again, it's not one specific site or view, it's a collection of them. If you check the session from the error and then check the vizql logs, there is a message in the json payload that references: 'session data not found'. At least that's the only common thing with the errors.

I found the fix for this. It's a browser extension called Grammarly that's not playing well with Tableau Server. Disable the extension fixed it for my users. This was happening on Chrome for both Windows and Mac.

I found the fix for this. It's a browser extension called Grammarly that's not playing well with Tableau Server. Disable the extension fixed it for my users. This was happening on Chrome for both Windows and Mac.

Had users with the same issue, installed Grammarly and replicated the error, removed it and it resolved the issue. Can confirm that Phillip's solution is correct for the ''Uncaught TypeError: $0.split is not a function' error'

Just wanted to let people now that this is not specific to Grammarly. And it's definitely not an issue consistently, only with tabs that have sub-tab navigation. Once I removed Screencastify the issue went away.